Application of silica Fume in Concrete

After silica fume is mixed into cement concrete, it can well fill the voids of cement particles and make the slurry more dense, mainly manifested in:

1. Increase the strength: greatly increase the compressive and flexural strength of concrete. Adding 5-10% silica fume, the compressive strength can be increased by 10-30%, and the flexural strength can be increased by more than 10%.

2. Increased density: the impermeability is increased by 5-18 times, and the chemical resistance is increased by more than 4 times.

3. Frost resistance: After 300-500 rapid freezing and thawing cycles of silica fume, the relative elastic modulus decreases by 10-20%, while ordinary concrete passes through 25-50 cycles, and the relative elastic modulus decreases to 30-73%.

4. Early strength: Silica fume concrete shortens the induction period and has the characteristics of early strength.

5. The ability to resist abrasion and cavitation erosion is increased by 3-16 times.

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